| West Islip to Orbetello | 4,174.68 mi (6,718.50 km) |
| West Islip to Oria | 4,527.77 mi (7,286.75 km) |
| West Islip to Oristano | 4,143.57 mi (6,668.44 km) |
| West Islip to Orta Nova | 4,412.36 mi (7,101.00 km) |
| West Islip to Orte | 4,225.73 mi (6,800.66 km) |
| West Islip to Ortona | 4,317.85 mi (6,948.91 km) |
| West Islip to Orvieto | 4,204.64 mi (6,766.71 km) |
| West Islip to Orzinuovi | 4,020.51 mi (6,470.38 km) |
| West Islip to Osimo | 4,237.86 mi (6,820.17 km) |
| West Islip to Ospitaletto | 4,021.54 mi (6,472.04 km) |
| West Islip to Ostuni | 4,516.68 mi (7,268.89 km) |
| West Islip to Ottaviano | 4,375.71 mi (7,042.02 km) |
| West Islip to Ovada | 3,989.07 mi (6,419.79 km) |
| West Islip to Ozieri | 4,139.08 mi (6,661.20 km) |
| West Islip to Paceco | 4,394.29 mi (7,071.93 km) |
